| // Copyright 2015 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // +build msan |
| |
| package runtime |
| |
| import ( |
| "unsafe" |
| ) |
| |
| // Public memory sanitizer API. |
| |
| func MSanRead(addr unsafe.Pointer, len int) { |
| msanread(addr, uintptr(len)) |
| } |
| |
| func MSanWrite(addr unsafe.Pointer, len int) { |
| msanwrite(addr, uintptr(len)) |
| } |
| |
| // Private interface for the runtime. |
| const msanenabled = true |
| |
| // If we are running on the system stack, the C program may have |
| // marked part of that stack as uninitialized. We don't instrument |
| // the runtime, but operations like a slice copy can call msanread |
| // anyhow for values on the stack. Just ignore msanread when running |
| // on the system stack. The other msan functions are fine. |
| // |
| //go:nosplit |
| func msanread(addr unsafe.Pointer, sz uintptr) { |
| g := getg() |
| if g == nil || g.m == nil || g == g.m.g0 || g == g.m.gsignal { |
| return |
| } |
| domsanread(addr, sz) |
| } |
| |
| //go:noescape |
| func domsanread(addr unsafe.Pointer, sz uintptr) |
| |
| //go:noescape |
| func msanwrite(addr unsafe.Pointer, sz uintptr) |
| |
| //go:noescape |
| func msanmalloc(addr unsafe.Pointer, sz uintptr) |
| |
| //go:noescape |
| func msanfree(addr unsafe.Pointer, sz uintptr) |
| |
| //go:noescape |
| func msanmove(dst, src unsafe.Pointer, sz uintptr) |
| |
| // These are called from msan_GOARCH.s |
| //go:cgo_import_static __msan_read_go |
| //go:cgo_import_static __msan_write_go |
| //go:cgo_import_static __msan_malloc_go |
| //go:cgo_import_static __msan_free_go |
| //go:cgo_import_static __msan_memmove |